Niv-Mizzet, Guildpact

Legendary Creature — Dragon Avatar{W}{U}{B}{R}{G}6/6

Flying, hexproof from multicolored Whenever Niv-Mizzet deals combat damage to a player, it deals X damage to any target, target player draws X cards, and you gain X life, where X is the number of different color pairs among permanents you control that are exactly two colors.

Colour identity Five-color · Flying, Hexproof from, Hexproof · Commander page

In short

Niv-Mizzet, Guildpact has 6 listed printings; the most valuable is the Serialized printing from MKM at US$629.75 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.